Improvement in dental drills



J. W. BAXTER. Denia! Drills.

N0. 139,039. vPatentdMa1y20.l873.

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UNITED STATES PATENT OFFICE.

JONATHAN W. BAXTER, OF VEVAY, INDIANA.

IMPROVEMENT IN DENTAL DRILLS.

Specification forming part of Letters Patent No. 139,039, dated May 20, 1873,' application filed February 1, 1873.

To all whom it may concern:

Be it known that I, J oNATHAN W. BAXTER, of Vevay, in the county of Switzerland and State of Indiana, have invented a new and Improved Dental Drill, of which the following is a specification:

The invention has for its object to furnish dentists with a rotary drill adapted to be operated by the hand through the medium of a worm, a toothed driving wheel, and pawl mechanism, arranged as hereinafter described.`

Figure 1 is a side elevation of my improved machine. Fig. 2 is partly a side elevation and partly a sectional elevation on a scale about twice as large as that of Fig. 1; and Fig. 3 is partly a side elevation and partly a sectional elevation, showing the arrangement for working the drill by foot-power.

Similar letters of reference indicate correspondin g parts.

A is the drill-spindle, which is arranged in the case B C D, and has a worm, E, in the part B togear with the driving-wheel F. It also has a weighted balance-wheel, G, in the part of the case. The driving-wheel F is arranged in a thin circular case, H, having an opening throughA one part ofthe rim-say the topand attached thereat to the part B of the drill-case, which also has an opening in the side to coincide with the opening of case H, so that the driving-wheel and the worm may gear together. The wheel F is jonrnaled in a spider-frame, I, secured in the case H,

f and the said case is arranged in the plane of the drill-case, so that it, together with the part B of the drill-case, constitutes the handle for the machine, by which it can be very conveniently held in one hand to present the drill L to the work. The wheel F is'turned by a pawl-crank, M, and a push-pawl, N, the latter extending down through the bottom of the oase H, and having a linger-piece, O, on the lower end to be acted on by the middle finger of the same hand by which the machine is held, which pushes it up and turns the wheel, and a spring, P, pushes it down again., Q represents the belt pulley, attached to the driving-wheel F, for working the drill by footpower by means of a belt, R, from a drivingwheel of a foot-power of any kind, the said belt passing through the rim of the case H in ed. V

JONATHAN WHITLOGK BAXTER.

Witnesses: A

GEORGE W. MENDELL, JOHN F. DoAN.

suitable holes and over guide-rollers, as shown; 

